Looks good if it's 4 letters. If it's a crossword it's better to include letter counts, postbridge, (and ideally post in Crosswords). If it's a quiz it's easier if the quiz theme is given. Danny usually gets them anyway though!
Ha ha - I can see the Litter at Ure.
It doesn't really prevent kittens at a River though- it just kills them off. Not a nice clue for the animal lovers if that is the answer.
Do we know the theme?